Halide perovskite quantum dots (Pe‐QDs) have been considered as outstanding candidates for photodetector, light‐emitting diode, and lasing applications, but these perspectives are being impeded by ...the severe stability, including both chemical and optical degradations. This study reports on amino‐mediated anchoring Pe‐QDs onto the surfaces of monodisperse silica to effectively depress the optical degradation of their photoluminescence (PL) and random lasing stabilities, hence achieving highly stable and low‐threshold lasing. An amination‐mediated nucleation and growth process is designed for the general and one‐pot synthesis of Pe‐QDs on the surfaces of silica spheres. The facile synthetic process, which can be finished within several minutes, insures scalable production. Surprisingly, almost no PL degradation is observed after 40 d storage under ambient conditions, even 80% PL intensity can be maintained after persistently illuminated by UV lamps for 108 h. Subsequently, extremely stable random lasing is achieved after storage for 2 months or over continuously optical pumping for 8 h. Such high PL and lasing stabilities originate from the isolation effects due to the effective anchoring, which separate the Pe‐QDs from each other and inhibit the photoinduced regrowth and deterioration. This work will also open the window of perovskite‐based multifunctional systems.
Amino‐mediated anchoring of perovskite quantum dots (QDs) onto the surfaces of monodisperse silica spheres separates the QDs from each other and inhibits the photoinduced regrowth and deterioration effectively, which also contributes to highly stable and low‐threshold random lasing. The general and one‐pot synthetic procedures ensure scalable production and open the window of perovskite‐based multifunctional systems.
A new type of physically linked double‐network hydrogel is synthesized by a simple, time‐saving, facile, easily controlled, one‐pot method. The resulting agar/polyacrylamide double‐network hydrogels ...exhibit good mechanical properties, excellent recoverability, and a unique free‐shapeable property, which makes them very promising hydrogels for load‐bearing soft tissues.
The reaction kinetics of sulfur cathodes generally control the performance of lithium−sulfur (Li−S) batteries. Here, N‐doped porous graphitic carbon with bound VN nanocrystals (3D VN@N‐PGC), which is ...synthesized in one pot by heating a mixture of glucose as C source, urea as N source, and NH4VO3 as V source, is reported to be an superior electrocatalytic cathode host for Li−S batteries. Notably, the VN nanocrystals, strongly bound to the N‐PGC network, form via in situ reactions among the thermolytic products of starting materials. The dopant N atoms and bound VN nanocrystals exhibit synergistic electrocatalytic effects to promote the cathode reactions of the Li−S cells. The observed enhancements are supported by density functional theory simulations and by the observation of electrocatalytic N‐ and V‐intermediate species, via X‐ray absorption near‐edge structure spectroscopy. Li−S cells assembled using 3D VN@N‐PGC as cathode host exhibit superior performance in terms of specific capacity (1442 mA h g−1 at 0.1 C), rate capability (641 mA h g−1 at 4 C), and cycle life (466 mA h g−1 after 1700 cycles at 2 C, corresponding to a capacity decay of 0.020% per cycle). The one‐pot methodology is facile and scalable and offers a new approach for synthesis of various metal nitride‐containing materials for other electrocatalytic applications.
A one‐pot strategy for the synthesis of N‐doped porous graphitic carbon with bound VN nanocrystals (3D VN@N‐PGC) is invented by heating a mixture of glucose as the C source, urea as the N source, and NH4VO3 as the V source. The 3D VN@N‐PGC as sulfur host exhibits superior electrocatalytic effects on the cathode reactions of Li−S batteries.
Organic framework materials constructed by covalently linking organic building blocks into framework structures are highly regarded as paragons to precisely control the material structure at the ...atomic level. Herein, a direct synthesis methodology is proposed as a guidance for the bulk synthesis of organic framework materials. Framework porphyrin (POF) materials are one‐pot synthesized to demonstrate the advances of the direct synthesis methodology. The as‐synthesized POF materials are intrinsically 2D and exhibit impressive versatility in composition, structure, morphology, and function, delivering a free‐standing POF film, hybrids of POF and nanocarbon, and cobalt‐coordinated POF. When applied as electrocatalysts for oxygen reduction reaction and oxygen evolution reaction, the cobalt‐coordinated POF exhibits excellent bifunctional electrocatalytic performances comparable with noble‐metal‐based electrocatalysts. The direct synthesis methodology and resultant POF materials demonstrate the ability of controlling materials at the atomic level for energy electrocatalysis.
Framework porphyrin (POF) materials are one‐pot synthesized to demonstrate the benefits of the direct synthesis methodology. The as‐synthesized POF materials are intrinsically two‐dimensional and exhibit impressive versatility in composition, structure, morphology, and function, delivering a free‐standing POF film, hybrids of POF and nanocarbon, and cobalt‐coordinated POF with excellent bifunctional oxygen electrocatalytic performances comparable with noble metal electrocatalysts.
Display omitted
•Fe3O4@LH was synthesized successfully via a one-pot synthetic strategy.•Application of Fe3O4@LH reduced soil total Pb by 16.7 %∼25.4 %.•Fe3O4@LH exhibited a maximum Pb adsorption ...capacity of 174.2 mg/g.•Adsorption process involved electrostatic adsorption, ion exchange, precipitation, and complexation.•Fe3O4@LH recovery exceeded 88.3% after a 90-day application period.
Lead (Pb) contamination in agricultural soils poses a significant threat to both ecosystems and human health. While nano-Fe3O4 exhibits promising potential for Pb remediation, its practical application in the soil is hindered by its’ biotoxicity, easy aggregation, and the risk of secondary pollution. Thus, this study presents a novel approach wherein Fe3O4 was incorporated into hydrogel via a one-pot synthetic strategy (Fe3O4@LH). This incorporation enhanced the mechanical properties and environmental stability of the hydrogel composites. Based on the mechanical properties, environmental stability, and single-point adsorption results for Pb, we selected Fe3O4@LH-4 for further research. The removal mechanism and the feasibility of employing Fe3O4@LH-4 for Pb removal from paddy soil were investigated through batch adsorption experiments and soil culture studies. Results showed that the adsorption process was primarily governed by swelling adsorption, electrostatic adsorption, ion exchange, precipitation, nanometer effect, and complexation mechanisms. The application of Fe3O4@LH-4 significantly led to the reduction of 16.7 %–25.4 % in soil Pb content, with removal rates escalating alongside increased dosage and application periods of Fe3O4@LH-4. Fitting results of the prediction model indicated that the Pb content in mildly Pb-contaminated soil (186.55 mg/kg) would decrease to be below the risk control standard for soil contamination of agricultural land in China (140 mg/kg) after 112 days of continuous application. Concurrently, cadmium and arsenic contents in the soil decreased by 5.2 %–10.8 % and 7.1 %–16.7 %, respectively. Moreover, the application of Fe3O4@LH-4 positively influenced soil nutrient levels, with total nitrogen and soil organic matter content significant increments of 13.6 %–41.0 % and 4.6 %–16.1 %, respectively. Furthermore, Fe3O4@LH-4 recovery exceeded 88.3 % after a 90-day application period. These findings underscore the potential of Fe3O4 incorporated hydrogel as a promising agent for the sustained removal of heavy metal Pb from paddy soil.
Anatase TiO2 nanowires have been directly synthesized via a one‐pot solvothermal approach. The curved nanowires with a length of ca. 300 nm and a diameter of ca. 10 nm are grown along the 101 ...direction and assembled into hierarchical structures. After annealing, the anatase TiO2 nanowires perfectly retain the nanostructure, and manifest excellent photocatalytic activity for the degradation of Rhodamine B.
The Front Cover shows the Ishihara test plate of a dimeric zinc tripyrrin complex. This compound is a side product of the Adler‐Longo porphyrin synthesis, which has been overlooked for more than half ...a century. It has now been found to act as the key intermediate in the formation of branched oligopyrroles like porphodimethenes. The detection and isolation of the metalated tripyrrin and the unraveling of its special reactivity were only possible after attempting the use of zinc acetate as template reagent during the oxidation step. More information can be found in the Full Paper by M. Bröring and co‐workers.
Inspired by biological systems, many biomimetic methods suggest fabrication of functional materials with unique physicochemical properties. Such methods frequently generate organic–inorganic ...composites that feature highly ordered hierarchical structures with intriguing properties, distinct from their individual components. A striking example is that of DNA–inorganic hybrid micro/nanostructures, fabricated by the rolling circle technique. Here, a novel concept for the encapsulation of bioactive proteins in DNA flowers (DNF) while maintaining the activity of protein payloads is reported. A wide range of proteins, including enzymes, can be simultaneously associated with the growing DNA strands and Mg2PPi crystals during the rolling circle process, ultimately leading to the direct immobilization of proteins into DNF. The unique porous structure of this construct, along with the abundance of Mg ions and DNA molecules present, provides many interaction sites for proteins, enabling high loading efficiency and enhanced stability. Further, as a proof of concept, it is demonstrated that the DNF can deliver payloads of cytotoxic protein (i.e., RNase A) to the cells without a loss in its biological function and structural integrity, resulting in highly increased cell death compared to the free protein.
Encapsulation of various bioactive proteins in DNA constructs is realized at physiological conditions by a biomimetic crystallization approach, based on the nucleation and growth of Mg2PPi crystals with organic additives such as proteins and DNA. This method offers highly simple and efficient protein loading while retaining the biological functionality of the payloads, opening up a new strategy for protein‐based therapeutics.
Although cotton is the most common polymer in daily life, its limited use is due to its propensity to catch fire. To solve this issue, we developed an innovative flame‐retardant aluminum ...phosphate‐supported, chitosan‐linked expandable graphite composite (CAlPEG). The CAlPEG was synthesized by the reaction of natural graphite, aluminum phosphate, and chitosan biopolymer in a one‐pot method. When CAlPEG was coated with cotton fabric and exposed to continuous flame, the fabric did not catch fire up to 760 s, whereas only expandable graphite (EG), aluminum phosphate (AIP), and CS, coated cotton fabric burned within 20 s. Flame‐retardant proficiency of CAlPEG‐coated cloth was confirmed by flame tests such as a limiting oxygen index (LOI) and vertical flammability test. The blank cotton has 17% LOI and is completely burnt out. On the other hand, the as‐prepared composite has a 43% LOI rating, which denotes a high level of flame retardancy. The VFT test result showed the formation of a 3 cm char, which confirms the flame‐retardant material possesses self‐extinguishing qualities. The article develops a new method for utilizing bioresources such as chitosan and offers fresh perspectives on the environmentally friendly synthesis of phosphorylated EG‐linked chitosan on the AlPO4 matrix.
Natural graphite is first transformed into expandable graphite in a one‐pot process using an acid mixture, such as ortho‐phosphoric acid and nitric acid. Chitosan and aluminum phosphate are added to the same pot and heated overnight to create a CAlPEG composite, which is then used as a flame retardant (FR) in cotton fabric. The composite has excellent flame resistance as demonstrated by factors like its high limiting oxygen index (LOI) value (43%) compared with ordinary cotton's low LOI value (17%), its shorter char length (3 cm) in VFT compared with blank cotton. It sustained even in contact with the flame for 760 s. This illustrates the future expansion of the cotton application using this FR.
PDF
